What is Django ORM?

Django ORM (Object-Relational-Mapping) is a feature in Django, a high-level Python web framework that enables programmers to interact with their database, like SQLite, Oracle, PostgreSQL, MySQL, etc. as if they were Python objects. Essentially, Django’s ORM allows you to translate your objects in Python into database tables and vice versa (Django documentation).

This feature provides the abstraction required to facilitate creating, retrieving, updating and deleting records in your database using Python programming constructs rather than writing SQL commands directly (Real Python).

Talking about the technical description, the Django ORM is constructed around the query interface. The Django models, which are subclasses of django.db.models.Model form the heart of the ORM. Instances of these models represent a database entry, and the attributes on a Django model are database fields. Each type of database field (e.g., Integer, Text, DateTime) is represented by an instance of a Field class (Official Django Documentation).

The Django ORM uses metaprogramming to create Python database-access API from Django models. Metaprogramming involves using these models to create tables in the database, and Django uses it to generate database-specific SQL and to execute SQL commands (Real Python).

The relationships among different database tables are represented using Python model classes through ForeignKey, ManyToManyField and OneToOneField. These form the basis of Django model instance methods, managers, and querysets, aiding in retrieving data (Django Documentation).

For example, when you want to create a new user in your database instead of writing an entire SQL command, you can achieve it by simply creating a User object in Python. Django ORM translates this object into a SQL command and executes it in the database.

```

Create a new user instance
new_user = User(username=‘new_user’, password=‘password’)
Save the object into your database
new_user.save()
```

This is advantageous as it helps abstract the process of interacting with the database. It also means you can change your database at any time without changing your Python code, as the Django ORM will take care of the transformation.

In conclusion, Django ORM allows you to interact with your database as if you are working with Python objects, making web development faster and more efficient as it abstracts and simplifies common database operations.

Sources:
1. Django documentation: https://docs.djangoproject.com/en/3.2/topics/db/models/
2. Real Python: https://realpython.com/django-orm-working-with-querysets/
3. Django Fields documentation: https://docs.djangoproject.com/en/3.2/ref/models/fields/